[Paraview] reading a list of ellipsoids into paraview quick and dirty

[David E DeMarle]

Hey Rich!

I recommend reading in the data directly with the CSV reader.

Then apply the table to points filter to convert the data from a table to a
point set. In  the T2P filter you specify which columns are x,y,z and which
are normal arrays.

>From there you can apply the glyph filter to scale and orient the
ellipsoids. Getting the scaling right may take a bit more work (a
calculator filter, preferably the numpy version) to get the orientation
angles into a 3 component wide vector array that the glyph filter knows how
to work with.

Doing it this way will be much more efficient since ParaView prefers few
proxies(think actors) with many elements over many proxies each with few
elements. It will be more efficient still if you use GL2 and the point
gaussian representation, which will do the transform on the GPU.

hth

David E DeMarle
Kitware, Inc.
R&D Engineer
21 Corporate Drive
Clifton Park, NY 12065-8662
Phone: 518-881-4909

On Mon, Mar 21, 2016 at 4:58 PM, Cook, Rich <cook47 at llnl.gov> wrote:

> Hi,
> I have a user that supplies me with a text file of ellipsoids specified by
> location, rotation, and axis, from which I plan to create Spheres modified
> by the Transform operator to make ellipsoids.  I can write a function that
> basically does this:
>
> ellipsoids = open(filename, 'r').read()
> for ellipse in ellipsoids:
> sphere1 = Sphere()
> renderView1 = GetActiveViewOrCreate('RenderView')
> sphere1Display = Show(sphere1, renderView1)
> transform1 = Transform(Input=sphere1)
> transform1.Transform = 'Transform'
> transform1.Transform.Translate = [0.0, 2.0, 0.0]
> transform1.Transform.Rotate = [0.0, 65.0, 76.0]
> transform1.Transform.Scale = [1.0, 2.0, 1.0]
> transform1Display = Show(transform1, renderView1)
>
>
> My question is, how can I use this approach to provide her a macro in the
> GUI somehow to read her file and populate her scene with ellipsoids?  I
> hope this question is clear enough.
>
> Thanks.
>
> --
> ✐Richard Cook
> ✇ Lawrence Livermore National Laboratory
> Bldg-453 Rm-4024, Mail Stop L-557
> 7000 East Avenue,  Livermore, CA, 94550, USA
> ☎ (office) (925) 423-9605
> ☎ (fax) (925) 423-6961
> ---
> Information Management & Graphics Grp., Services & Development Div.,
> Integrated Computing & Communications Dept.
> (opinions expressed herein are mine and not those of LLNL)
>
>
>
>
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